Large Model Association Forum

Has anybody had any problems with a jet tronic j valve.I have one that when it is in the down position it leaks air,in the up it's ok unfortunately they are a sealed unit so you can't see the piston/solenoid working.Any info will be appreciated.
Thanks. Brian Rawcliffe 1669

Problem cured,i removed a blank plug and squirted some Pitstop ptfe into the port operated it a few times and it is now ok.
Probably freed the O ring .Brian.